Turn on the Always Connected option in the Fitbit app. This setting improves the Bluetooth connection between your phone and Fitbit device. Note that turning on this feature may cause the battery on your Fitbit device to drain more quickly than normal.

Turn on All-Day Sync in the Fitbit app. This setting prompts your Fitbit device to periodically sync with the Fitbit app but may shorten battery life on your phone or Fitbit device.

If syncing difficulty persists, remove all other Fitbit devices from your account and try to sync. If your device still doesn't sync, contact Customer Support.

Windows 10 Computer

Syncing difficulty is usually caused by a missing requirement. Verify each requirement before moving on to the troubleshooting steps.

The most recent version of the Fitbit app for Windows 10 is installed.

Fitbit Connect software isn't installed.

This software helps computers that can't run the Fitbit app for Windows 10 communicate with a device, so if you've had a Fitbit device for a while or someone else who uses the computer had one you may have Fitbit Connect installed. Look for an icon with the Fitbit logo () near the date and time on your computer screen. If you see this icon, uninstall Fitbit Connect using the same process for uninstalling any program.

If your computer doesn't support Bluetooth, it can still communicate with your device if you purchase a wireless sync dongle from the Fitbit Store.

If your device still won't sync, try these steps:

From the Start menu go to Settings > Bluetooth. Make sure you see your device on the list with the word “Connected” below.

If your device isn't connected:

Tap or click the device name and choose Remove Device.

Make sure your device is nearby and wait for it to reappear in the devices list.

When it does, tap or click the device again and choose Pair. The pairing process can take several minutes but when it's done the Bluetooth status should change to “Connected.”

If your device is connected but won't sync, it's possible your computer's Bluetooth signal is weak or temporarily compromised. Try using the wireless sync dongle, available from the Fitbit Store.

If your Fitbit device won't sync after you reinstall the app, log in to your Fitbit account on a different phone, tablet, or computer and try to sync.

If your Fitbit device still doesn’t sync, remove all other Fitbit devices from your account and from the list of connected Bluetooth devices on your computer and try to sync.

Mac or Windows 8.1 Computer

Syncing difficulty is usually caused by a missing requirement. Verify each requirement before moving on to the troubleshooting steps.

Fitbit Connect is installed. To check, look for an icon with the Fitbit logo () near the date and time on your computer screen. If you can't find it, try the set up instructions again in How do I set up my Fitbit device?

During set up your device connected ("paired") to your Fitbit account successfully. To check, log into your fitbit.com account and click the gear icon () in the top right corner. You should see your Fitbit device's name at the top of the menu. If you don't, click the Fitbit Connect icon (). Choose Open Main Menu > Set Up a New Device and follow the instructions to pair your device.

If you're using a Mac and want to sync over Bluetooth, make sure Bluetooth is turned on. To check, go to System Preferences > Bluetooth > Turn Bluetooth On.

If your computer doesn't support Bluetooth, it can still communicate with your device if you purchase a wireless sync dongle from the Fitbit Store.

If you use more than one device to sync, make sure the other device isn't nearby. If the device is nearby, turn off Bluetooth on it.

If your device still won't sync, try the steps below. Note that your fitbit.com dashboard always shows the time of your last successful sync. Just click the gear icon in the top right.

Prompt Fitbit Connect to sync with your device:

Click the Fitbit Connect icon and click Open Main Menu.

With your charged Fitbit device nearby, click Sync Now.

You may be asked to sign in to your Fitbit account, after which your device should sync. If you see a message saying your device can't be found, wake it up by pressing its button (most devices) or tapping it (Flex and Zip).

(Mac only) If your computer has Bluetooth:

Turn Bluetooth off and back on under System Preferences > Bluetooth. If syncing still doesn't work, your Bluetooth signal may be weak or temporarily compromised.

If your device won't sync after the restart, next try uninstalling and reinstalling Fitbit Connect. For instructions see About the Fitbit app.

If your Fitbit device still doesn’t sync, remove all other Fitbit devices from your account and try to sync.

If you can't sync to a compatible phone or tablet instead or your Fitbit device didn't come with a wireless sync dongle, contact Customer Support.

After weighing in on Fitbit Aria or Fitbit Aria 2, the scale should display a progress bar, followed by a check mark, which indicates the new measurement synced successfully.

If the scale doesn't sync, you may see one of the following error messages on the scale’s screen:

NO SYNC

WIFI Symbol with an “X”

WRONG PASSWORD

CONNECTION ERROR

CAN'T CONNECT

NO WIFI

WEAK SIGNAL

No error message, but the measurement doesn't sync to your Fitbit account

If any of these conditions occur, try weighing yourself again. If the scale successfully syncs, it may have been a temporary issue that doesn't require further troubleshooting. If the problem persists, try the following tips:

Check that your router is on and working. If other devices are also unable to connect to your Wi-Fi network, restart your router.

Remove the batteries from your scale for 10 seconds, then reinsert them to restart your scale.